[Update: Michael St Nietzel also pointed out that there's an issue with installers that verify a checksum before installation. In fact, this is a special case of an issue I may not have made completely clear before: unless this approach is combined with some form of whitelisting, there has to be some way of reversing the modification

Even in Europe, we have a rough idea of what Thanksgiving is about, though we don't celebrate it at the same time or in the same way. However, Black Friday and Cyber Monday are rather less well known outside the US. Since Randy has already blogged on Cyber Monday and its security implications at http://www.eset.com/threat-center/blog/2009/11/19/is-cyber-monday-the-end-of-shopping-as-we-know-it, I took the